# Relationship history for MSHA mine 1518721

Current hierarchy: **American Resources Corporation → McCoy Elkhorn Coal Co. → Mine #23**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James River Coal Company → Mine #23; 1988-09-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McCoy Elkhorn Coal Corp. → Mine #23; 2004-02-19 to 2014-09-05; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → McCoy Elkhorn Coal Corp.; 2004-02-19 to 2014-09-05; source msha-controller-operator-history
- **operator_operates_mine:** McCoy Elkhorn Coal Co. → Mine #23; 2014-09-06 to 2016-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Opes Resources Inc → Mine #23; 2014-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Opes Resources Inc → McCoy Elkhorn Coal Co.; 2014-09-06 to 2016-02-16; source msha-controller-operator-history
- **operator_operates_mine:** McCoy Elkhorn Coal Co. → Mine #23; 2016-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quest Energy Corporation → Mine #23; 2016-02-17 to 2019-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Quest Energy Corporation → McCoy Elkhorn Coal Co.; 2016-02-17 to 2019-10-08; source msha-controller-operator-history
- **controller_controls_mine:** American Resources Corporation → Mine #23; 2019-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Resources Corporation → McCoy Elkhorn Coal Co.; 2019-10-09 to current/open; source msha-controller-operator-history